Since quiescent galaxies reside in more massive
halos than AGN hosts of the same stellar mass,
it is not appropriate to use them to form a
comparison sample to investigate the host galaxies of
AGNs in their environment and evolutionary stages relative
to the average population. Note that only a small
fraction, about \(3\sim 5\)  percents of galaxies with
large \(D_n4000\) , at which quenched galaxies dominate,
have strong AGN activities (Figure REF ).
Assuming that quiescent galaxies are quenched long time ago,
[1]} also suggested the exclusion of quiescent galaxies in
comparing AGNs with normal galaxies. Our results provide
further justifications for such an approach.
